She hides behind a mask.

The words 
Written on your arm 
It's your little secret, 
Known as self harm 
Not only your arm
But your legs stomach and hip
Come on girl seriously
Get a grip. 

On the outside 
Nobody sees 
No one can tell 
That you're falling to your knees 
In public 
You always have your smile 
But when you get home 
It goes away for a while 

You've become a pro 
It's so simple to hide 
But you're sinking further down
Being pulled by the tide 
When will it be over?
I can't help but ask 
You need to get help dear 
Please take off the mask